This group of mostly ornamental flowering trees or shrubs has both common and scientific name difficulties which can be very confusing. Over the years, the genus Cassia has had as many as 1,000 assigned species, but many species have been transferred to other genera such as Senna. At present it is not clear how many Cassia species there are, but there are estimated to be hundreds. Adding to the confusion is the fact that cassia as a common name can refer to cassia bark, taken from the unrelated tree Cinnamonum verum, a source cinnamon spice. Two other products are cassia gum, a food additive, and cassia herbal tea made from the seeds, both coming from Senna obtusifolia (syn. C. obtusifolia). Cassia trees, in the broad sense, are native throughout the tropics, with some species in temperate regions; they do well in desert climates. Across their range native stands are valuable sources of wood, forage for livestock, shade and to improve soils by fixing atmospheric nitrogen. Cassia trees have been used widely as ornamental plants and in reforestation efforts in the desert. The popularity of cassia trees in landscaping is due to a combination of attractive factors. They are of medium size, have delicate feathery leaves (evergreen, semi-deciduous or deciduous) and attractive gray bark, bear showy colorful flowers (white, yellow, pink, orange or purple blooms), are hardy and drought tolerant and easy to propagate from seed and respond well to pruning. Among the many landscape applications of cassia trees are as accent tree, as an anchor plant for a flower bed, along a sidewalk, driveway property line or blank wall and a specimen and shade tree on a lawn. Treeworld has in stock 7 species of Cassia plants of various sizes from which to select the best plants for landscaping any residential, commercial or public location.